Good morning, @donmoss. 

Thank you for following up with us. 

You're right, having this feature available for purchase orders would come in handy. As mentioned by my colleague above, this feature isn't available for QuickBooks Online yet. We have submitted feedback to our product engineers on your behalf, so this could be considered in a future update.  

Please know you can always reach out to the Community or me anytime you have questions or concerns. I'll be here to lend you a helping hand in getting you back to business. Enjoy your day!